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Finding the Fourth Proportional to 257.78, 353.77 and 255.96

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Solution

The fourth proportional to 257.78, 353.77 and 255.96 is: 351.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.78 : 353.77 = 255.96 : x
  2. Step 2: Convert to fraction form
    257.78/353.77 = 255.96/x
  3. Step 3: Cross multiply
    257.78x = 353.77 × 255.96
  4. Step 4: Simplify right side
    257.78x = 90,550.33
  5. Step 5: Solve for x
    x = 90,550.33/257.78
  6. Step 6: Final answer
    x = 351.27

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.